Proto-Sino-Tibetan: *jăŋ
Meaning: luck, happiness
Tibetan: g-jaŋ happiness, blessing.
Comments: Bod. 95. Cf. STEDT 364-365 *yaŋ 'love, desire'. It is not quite clear whether the meaning 'copulate' attested only in Baima is archaic; if it is, the root could be ultimately = *jaŋ 'penis' q.v.